A leaky skylight is usually the flashing

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A skylight that drips is almost never the glass, it is the flashing and curb seal around the unit. In the valley the freeze-thaw cycle works the sealant loose year over year, and a unit that sealed fine for a decade starts weeping at a corner.

What actually leaks

The curb flashing at the uphill side takes water first, then the corner seals where the curb meets the deck. Condensation inside the glass reads like a leak but is a different problem, a failed insulated glazing unit that fogs between panes. A roofer can tell which one you have from where the water shows.

Repair versus replace

If the unit is otherwise sound, re-flashing the curb and resealing fixes it. If the skylight is old enough that the dome crazes or the mechanism fails, replacement is often the honest answer, a modern unit with proper curb flashing costs less than repeated patch attempts on a unit at end of life.

What to describe in the request

Where the water shows, whether it drips or fogs, and the skylight's approximate age if you know it. A photo of the unit from outside helps; the roofer can usually tell the curb type before climbing on the roof.